It is possible to produce an unexpected error using multiple Schedule and Code Blocks

Steps to reproduce:
1. Create new LP
2. Add following blocks in following order:

• Schedule block (name: S1)
• Code block (content: "1")
• Schedule block (name: S2)
• Code block (content: "2")
• Schedule block (name: S3)

3. Set overflow from S1 to S2, S2 to S3
4. Publish LP
5. Switch to Edit mode

Result:

• Unexpected error appears in the UI.
• Entry is present in logs:
  • [1.10.0-beta]

    2017-06-21 08:26:56] request.CRITICAL: Uncaught PHP Exception Symfony\Component\Debug\Exception\ContextErrorException: "Catchable Fatal Error: Argument 1 passed to Tree\Node\Node::addChild() must implement interface Tree\Node\NodeInterface, null given, called in /Users/mnocon/Desktop/studio_demo/vendor/ezsystems/landing-page-fieldtype-bundle/src/FieldType/LandingPage/Model/Block/ScheduleBlock/ScheduleService.php on line 52 and defined" at /Users/mnocon/Desktop/studio_demo/vendor/nicmart/tree/src/Node/NodeTrait.php line 68

    Unknown macro: {"exception"}

  • [1.7.3]

    2017-06-21 09:41:35 request.CRITICAL: Uncaught PHP Exception Symfony\Component\Debug\Exception\ContextErrorException: "Catchable Fatal Error: Argument 1 passed to EzSystems\LandingPageFieldTypeBundle\FieldType\LandingPage\Model\PageService::moveForward() must be an instance of EzSystems\LandingPageFieldTypeBundle\FieldType\LandingPage\Model\BlockValue, null given, called in /Users/mnocon/Desktop/studio_demo/vendor/ezsystems/landing-page-fieldtype-bundle/src/FieldType/LandingPage/Model/PageService.php on line 225 and defined" at /Users/mnocon/Desktop/studio_demo/vendor/ezsystems/landing-page-fieldtype-bundle/src/FieldType/LandingPage/Model/PageService.php line 220

    Unknown macro: {"exception"}